“Thales, the Milesian, is said to be the first author of it1; who used to say, that, for a man to know himself, is the hardest thing in the world2. It was afterwards adopted by Chylon the Lacedemonian; and is one of those three precepts which Pliny affirms to have been consecrated at Delphos in golden letters. It was afterwards greatly admired, and frequently used by others1; till at length it acquired the authority of a divine oracle; and was supposed to have been given originally by Apollo himself. Of which general opinion Cicero gives us this reason; "because it hath such a weight of sense and wisdom in it, as appears too great to be attributed to any man*." And this opinion, of its coming originally from Apollo himself, perhaps was the reason that it was written in golden capitals over the door of his temple at Delphos.
And why this excellent precept should not be held in as high esteem in the Christian world as it was in the heathen, is hard to conceive. Human nature is the same now as it was then: the heart as deceitful; and the necessity of watching, knowing, and keeping it, the same.”

Source: Blood & Beauty: The Borgias

Answer to the Conference at the Committee at Whitehall, Second Protectorate Parliament http://www.british-history.ac.uk/report.asp?compid=36885 (13 April 1657), quoted in The Diary of Thomas Burton, esq., volume 2: April 1657 - February 1658 (1828), pp. 496-497

Introduction : The Reason for the Examination
A Perplexed Philosopher (1892)
Context: The respect for authority, the presumption in favor of those who have won intellectual reputation, is within reasonable limits, both prudent and becoming. But it should not be carried too far, and there are some things especially as to which it behooves us all to use our own judgment and to maintain free minds. For not only does the history of the world show that undue deference to authority has been the potent agency through which errors have been enthroned and superstitions perpetuated, but there are regions of thought in which the largest powers and the greatest acquirements cannot guard against aberrations or assure deeper insight. One may stand on a box and look over the heads of his fellows, but he no better sees the stars. The telescope and the microscope reveal depths which to the unassisted vision are closed. Yet not merely do they bring us no nearer to the cause of suns and animal-cula, but in looking through them the observer must shut his eyes to what lies about him. That intension is at the expense of extension is seen in the mental as in the physical sphere. A man of special learning may be a fool as to common relations. And that he who passes for an intellectual prince may be a moral pauper there are examples enough to show.

Anarchist Manifesto (1850)
Context: Indeed:
Who says anarchy, says negation of government;
Who says negation of government, says affirmation of the people;
Who says affirmation of the people, says individual liberty;
Who says individual liberty, says sovereignty of each;
Who says sovereignty of each, says equality;
Who says equality, says solidarity or fraternity;
Who says fraternity, says social order;
By contrast:
Who says government, says negation of the people;
Who says negation of the people, says affirmation of political authority;
Who says affirmation of political authority, says individual dependency;
Who says individual dependency, says class supremacy;
Who says class supremacy, says inequality;
Who says inequality, says antagonism;
Who says antagonism, says civil war;
From which it follows that who says government, says civil war.

in Aquinas: Selected Political Writings (Basil Blackwell: 1974), p. 183
Commentary on the Sentences of Peter Lombard

La prétendue supériorité de l'homme sur la femme et la despotique autorité qu'il s'arroge sur elle ont la même origine que la domination de la noblesse.
[in Gracchus Babeuf avec les Egaux, Jean-Marc Shiappa, Les éditions ouvrières, 1991, 44, 27082 2892-7]
On women

Spiritualism and Theosophy (1880)

Source: The Scientific Analysis of Personality, 1965, p. 18